<template>
    <div>
      <!-- 面包屑导航器 -->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区-->
      <el-card>
        <el-alert
          title="添加商品信息"
          type="info"
          show-icon :closable="false">
        </el-alert>
        <!--步骤条 active激活-->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!--tabs栏-->
        <el-form :model="addForm" :rules="addFormRules"  label-position="top" ref="addFormRef" label-width="100px" class="demo-ruleForm">
           <el-tabs v-model="activeIndex" tab-position="left" @tab-click="tabClicked" :before-leave="beforeTabLeave">
              <el-tab-pane label="基本信息" name="0">
                 <el-form-item label="商品名称" prop="goods_name">
                   <el-input v-model="addForm.goods_name"></el-input>
                 </el-form-item>
                 <el-form-item label="商品价格" prop="goods_price">
                  <el-input v-model="addForm.goods_price" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品重量" prop="goods_weight">
                  <el-input v-model="addForm.goods_weight" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品数量" prop="goods_number">
                   <el-input v-model="addForm.goods_number" type="number"></el-input>
                 </el-form-item>
                 <el-form-item label="商品分类" prop="goods_cat">
                   <el-cascader
                     expand-trigger="hover"
                     v-model="addForm.goods_cat"
                     :options="cateList"
                     :props="cascaderProps"
                     @change="cateChanged" clearable change-on-select >
                   </el-cascader>
                 </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品参数" name="1" >
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id" >
                  <el-checkbox-group v-model="item.attr_vals" >
                    <el-checkbox border :label="cb" v-for="(cb , i) in item.attr_vals" :key="i"></el-checkbox>
                  </el-checkbox-group>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                  <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品图片" name="3">
                <!--action表示图片要上穿的api地址 list-type显示效果-->
                <el-upload
                  action="http://timemeetyou.com:8889/api/private/v1/upload"
                  :headers="headerObj"
                  :on-preview="handlePreview"
                  :on-remove="handleRemove"
                  :on-success="handleSuccess"
                  list-type="picture">
                  <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
              </el-tab-pane>
              <el-tab-pane label="商品内容" name="4">
                 <!-- 文本编辑器 -->
                 <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                 <el-button type="primary" class="btn" @click="add">添加商品</el-button>
              </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>
      <!-- 图片预览的对话框-->
      <el-dialog
        title="图片预览"
        :visible.sync="PicDialogVisible"
        width="50%"
      >
        <img :src="picUrl" class="pic">
      </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 步骤条激活下标
      activeIndex: '0',
      // 添加商品的表单
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片路径
        pics: [],
        // 商品描述
        goods_introduce: '',
        attrs: []
      },
      // 商品分类列表
      cateList: [],
      // 商品参数列表
      manyTableData: [],
      onlyTableData: [],
      // 图片上传的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 商品参数的描述
      attrVals: [],
      // 服务器的图片地址
      picUrl: '',
      cascaderProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      PicDialogVisible: false,
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品参数
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.cateList = res.data
    },
    // 级联变化触发 验证是否是三级
    cateChanged () {
      if (this.addForm.goods_cat.length !== 3) {
        // 清空级联表
        this.addForm.goods_cat = []
      }
    },
    // 标签切换函数
    beforeTabLeave (activeName, oldActiveName) {
      if (this.addForm.goods_cat.length === 3) {
        this.activeIndex = activeName
      } else {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
      if (this.activeIndex === '1') {
        // 请求参数列表
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取商品参数失败')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        })
        this.manyTableData = res.data
      }
      if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取商品属性失败')
        this.onlyTableData = res.data
      }
    },
    // 上传后的回调函数
    handleSuccess (response) {
      // 拼接获得一个图片信息对象
      const picinfo = { pic: response.data.tmp_path }
      // push到pics中
      this.addForm.pics.push(picinfo)
      this.picUrl = response.data.url
    },
    // 处理图片预览效果
    handlePreview () {
      this.PicDialogVisible = true
    },
    // 处理图片删除事件
    handleRemove (file) {
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x =>
        x.pic === filePath)
      this.addForm.pics.splice(i, 1)
    },
    // 添加商品
    add () {
      // 对添加表单进行验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单数据')
        // 添加请求
        // lodash 深复制
        const addGood = _.cloneDeep(this.addForm)
        addGood.goods_cat = addGood.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        addGood.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', addGood)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
  .el-checkbox{
     margin: 0 7px 0 0 !important;
  }
  .pic{
     width: 100%;
  }
  .btn{
     margin-top: 15px;
  }
</style>
